Extracting the σ-term from low-energy pion-nucleon scattering

Ruiz de Elvira Carrascal, Jacobo; Hoferichter, Martin; Kubis, Bastian; Meißner, Ulf-G (2018). Extracting the σ-term from low-energy pion-nucleon scattering. Journal of Physics G: Nuclear and Particle Physics, 45(2), 024001. Institute of Physics Publishing IOP 10.1088/1361-6471/aa9422

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We present an extraction of the pion-nucleon (πN) scattering lengths from low-energy πN scattering, by fitting a representation based on Roy–Steiner equations to the low-energy data base. We show that the resulting values confirm the scattering-length determination from pionic atoms, and discuss the stability of the fit results regarding electromagnetic corrections and experimental normalization uncertainties in detail. Our results provide further evidence for a large πN σ-term, σπN = 58(5) MeV, in agreement with, albeit less precise than, the determination from pionic atoms.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Ruiz de Elvira Carrascal, Jacobo

Subjects:

500 Science > 530 Physics

ISSN:

0954-3899

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

02 Mar 2018 12:50

Last Modified:

30 Nov 2019 07:06

Publisher DOI:

10.1088/1361-6471/aa9422

ArXiv ID:

1706.01465

BORIS DOI:

10.7892/boris.109956

URI:

https://boris.unibe.ch/id/eprint/109956

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